Rôle de l’informatique dans la prévision des caractéristiques mécaniques des aciers au carbone et faiblement alliés

Archives of Metallurgy and Materials

“…The promising steel chemical composition ranges and Q&T conditions were identified on the basis of mathematical models able to predict the strength of Q&T steels [8,9]. Investigated steels were selected in order to have various C eq levels (from 0.41% to 0.56%).…”

“…The adopted model [9,10] is able calculate to minimum cooling rates for martensite (vcrM), bainite (vcrB) and ferrite/ pearlite formation (vcrP) according to:…”

“…where vcr(i) is the critical cooling rate in K/h, Kv, KP, Fj are coefficients reported in [8][9] and the quantity wt %j represents the weight percent of the element j.…”

“…The model is also able to predict the hardness of the single phases, according to: The application of mathematical models [8,9] indicated that, in order to attain high yield strength levels (YS > 550 MPa) on the Q&T material, it is necessary to have after quenching a microstructure mainly constituted of low-C martensite (> 30%) and bainite, otherwise too low tempering temperatures are required with possible detrimental effects on toughness.…”